The present invention is directed toward a window or door insulation system including an attachable trim strip, and a securable transparent sheet, to create a removable and auxiliary insulation sheet. The trim strip includes a base attachable to a surface, a cover pivotably connected to the base, and an interior strip pivotably connected to the cover and base. The cover includes a first wall, an intermediate wall transitioning from the first wall, and a second wall transitioning from the intermediate wall. The first wall is pivotably connected to a first side of the base so that the cover is configured to be an open position or a closed position. A gap is defined between the second wall of the cover and the second side of the base when in the closed position. The interior strip is configured to keep the cover opened or closed.